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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 11, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Leases, Future Minimum Payments Due, Total |  |  | $ 117.8 |  | $ 117.8 |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  |  | 34.9 |  | 34.9 |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  |  | 29.9 |  | 29.9 |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  |  | 20.7 |  | 20.7 |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  |  | 13.7 |  | 13.7 |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  |  | 18.6 |  | 18.6 |  |
Operating Leases, Rent Expense, Net, Total |  |  |  |  | 98.7 | $ 64.3 | $ 44.1
Purchase Obligation, Due in Next Twelve Months |  |  | 381.6 |  | 381.6 |  |
Loss Contingency, Estimate of Possible Loss |  |  | 1.3 |  | $ 1.3 |  |
Lawsuit for Claims of Unpaid Wages, Failure to Provide Meal and Rest Periods, and Other Items [Member] |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  | $ 15.0 |  |  |  |  |
Arbitration Case with BNSF [Member] |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  |  | $ 18.3 |  |  |
Arbitration Case with BNSF [Member] | Second Interim Award by Abritrators [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value | $ 89.4 |  |  |  |  |  |
Arbitration Case with BNSF [Member] | Second Interim Award by Abritrators for 2016 Period at Issue [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value | 52.1 |  |  |  |  |  |
Arbitration Case with BNSF [Member] | Second Interim Award by Abritrators for 2017 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value | $ 37.3 |  |  |  |  |  |
Arbitration Case with BNSF [Member] | Interim Award, Contingent Liabilities for Period of May 1, 2016 through December 31, 2017 [Member] |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  | 89.4 |  |  |  |
Arbitration Case with BNSF [Member] | Interim Award, Contingent Liabilities for Period of January 1, 2018 through December 31, 2018 [Member] |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  | 44.6 |  |  |  |
Arbitration Case with BNSF [Member] | Interim Award, Contingent Liabilities for Period of May 1, 2016 through December 31, 2018 [Member] |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  | $ 134.0 |  |  |  |

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